Where inside a star are the conditions for ionization the most extreme?
Answer
The core, due to the highest temperature and pressure.
The core of a star experiences the highest temperatures and pressures, which generates conditions far beyond what is needed to achieve nearly complete ionization of the material.

Related Questions
What state of matter dominates the universe and includes stars like our Sun?What process fundamentally creates plasma from a gas?What state must a star achieve to sustain energy generation via nuclear fusion?What unique physical characteristics distinguish plasma from a neutral gas?What is the estimated plasma composition of the Sun?Where inside a star are the conditions for ionization the most extreme?How does stellar plasma fundamentally differ from laboratory plasma created on Earth?What is the physical requirement for nuclear fusion that necessitates the plasma state?If a star's outer shell has low ionization, why is the entire body still considered plasma?For which type of star is the answer that it is definitively plasma certain?